#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int n = 0;
	while (scanf("%d", &n) != EOF)
	{  
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < n; j++)
			{
				if (i == 0 || i == n - 1)
				{
					printf("* ");
				}
				else if (j == 0 || j == n - 1)
				{
					printf("* ");
				}
				else
				{
					printf("  ");
				}
			}
			printf("\n");
		}
	}
	return 0;
}
